Visual suppression of the vestibulo-ocular reflex was studied in 16 subjects on 4 Space Shuttle missions. Eye movements were recorded by electro-oculography while subjects fixated a head mounted target during active sinusoidal head oscillation at 0.3 Hz. Adequacy of suppression was evaluated by the number of nystagmus beats, the mean amplitude of each beat, and the cumulative amplitude of nystagmus during two head oscillation cycles. Vestibulo-ocular reflex suppression was unaffected by space flight. Subjects with space motion sickness during flight had significantly more nystagmus beats than unaffected individuals. These susceptible subjects also tended to have more nystagmus beats before flight.


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    Title :

    Visual Suppression of the Vestibulo-Ocular Reflex during Space Flight


    Contributors:
    J. J. Uri (author) / W. E. Thornton (author) / T. P. Moore (author) / S. L. Pool (author)

    Publication date :

    1989


    Size :

    14 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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